Yes, 18.
They're funny at their random choosings. It was always said to me "you're statistically unlikely to get jury duty. So enjoy this rare opportunity to see legal proceedings and make a difference!"

Two weeks after I'd finished a month-and-a-half stint, I got another summons.

Did mine four years ago, actually enjoyed it... Bit intense though, had a week long trial the second week for death by dangerous driving. The only one in the first week was a guy who was up for stealing a mountain bike and five pounds in cash, changed his plea the second he saw my steely glare.